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REVENUE RECOGNITION - Schedule of notes receivable balances (Details) - Notes Receivable - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Revenue Recognition (Details) - Schedule of notes receivable balances [Line Items]
Note receivable	$ 266	$ 1,166
Allowance for losses	(266)	(292)
Notes receivable, net	$ 0	$ 874

X

- Definition

Note receivable.

+ References

No definition available.

+ Details

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- References

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X

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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X

- Definition

The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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